How do I fix the code P0171 on my Ford?

Remove the mass air flow sensor and clean the sensor using mass air flow cleaner or contact cleaner. Reinstall the mass air flow sensor and clear the check engine light using FIXD. If the check engine light comes back on with code P0171 continue the diagnostic process.

Can a bad pcv valve cause P0171?

The most common causes of the P0171 code are vacuum or intake leaks, low fuel pressure, faulty PCV valve, or a faulty MAF sensor. Other things can also cause the P0171 code.

How do you fix DTC code p0171 Ford Explorer?

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How to fix p0171 code?

Replace faulty vacuum hoses or gaskets around the intake

  • Repair other intake leaks
  • Replace PCV Valve
  • Replace the fuel pump/fuel filter/fuel pressure regulator or repair wirings
  • Replace EVAP valve
  • Replace O2 sensor (s)
  • Replace EGR valve
  • Replace MAP/MAF sensor
  • Repair exhaust leak
  • Replace coolant temperature sensor
  • How to fix code p0171 and p0174?

    Mass Airflow Sensor (MAF).

  • Intake manifold gasket leak • fuel injector O-ring leaks (the key to finding fuel injector O-ring leaks is to compare the fuel trims when cold versus hot because the o-rings
  • Missing,cracked vacuum hose to MAP sensor
  • Faulty MAP sensor
  • What is p0171 engine code?

    The first code, P0171 (, is an indication the engine is running lean. This code can indicate anything from clogged air and fuel filters to problems with O2 sensors and mass air flow sensors to intake gaskets.